<!DOCTYPE html>
<html>
<head>
	<title>锚点</title>
</head>
<body>
	<p>根据ID和href="#ID"来确定锚点</p>
	<p>bootstrap 自动锚点</p>
	<a href="#a">到底</a>


	<div style="height: 1000px"></div>



	<a href="#" id="a" style="margin-bottom: 40px">上去！！！！！！</a>

</body>
</html>